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The world鈥檚 oldest fossilised forest was uncovered in Somerset last week. We head to palaeobotanist, Dr Christopher Berry鈥檚, lab at Cardiff University to learn about these cladoxylopsids. They lived 390 million years ago and although they are not the ancestors of today鈥檚 trees, they reveal some extraordinary evolutionary secrets.

Also, Marnie speaks to Dr Chris Thorogood of the University of Oxford Botanic Gardens鈥痑bout his new book Pathless Forest: The Quest to Save the World鈥檚 Largest Flowers. Called 鈥淩afflesia鈥� plants and found in the remotest parts of South East Asia, their flowers burst from the rain forest floor the size of pumpkins and are critically endangered. Chris talks of his world of extreme fieldwork and hair-raising expeditions, braving leeches, lizards and lethal forest swamps, to discover the rarest of rare blooms.

Plus, the Wildlife Trust鈥檚 Making Friends with Molluscs campaign starts today, and I鈥檓 sure many gardeners will declare this an impossible task! We visit some allotments in Bristol to find out how people are managing slug and snail populations. And chat to Brian Eversham from the Trust of Bedfordshire, Cambridgeshire and Northamptonshire, who explains why these garden creatures should be considered our friends, not foes.

And finally, Dr Stewart Husband from last week鈥檚 programme returns to answer more of your burning questions about your tap water.